I have prepared zinc oxide sputter target by using PVA as the binder. But in case of Tungsten target whether PVA is suitable and will it react with tungsten?
PVA cannot react with tungsten, but if you do not completely remove it during firing (for example, by heating the compact too quickly above 400°C), then the carbon that remains from the thermal decomposition of PVA will be able to react with tungsten when further heated above 800°C. As a result, your tungsten target will have a small amount of tungsten carbides. I believe that even in this case there should be no problems with the work of the target.
You need to press tngsten powders using specialised powder technologies.
K. Sreenivas Respected sir, After pressing the tungsten powder and making a target using hydraulic press, at what temperature it should be annealed in ordered to obtain a perfect target for sputtering?
Depends on the metal, W has a pretty high melting point. Check the literature on powder metallurgy, and see what is available for W powders. It is an advanced processing technology.
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